I sold to Walmart for 4 years. In the beginning we believed we were lucky to become vendors. Then we realized how much stress they created. Every single year they would short pay our invoices. We would have to submit a claim with Walmart accounting. This process was completely and utterly time consuming. But the worst of it, they wouldn't pay the invoices owed until a year later. It's hard to float a $100,000 short pay as a small business.
They did much more and I was surprised that they existed this way in business
They did much more and I was surprised that they existed this way in business